package sym.qrcode.decoder;

public final class ErrorCorrectionLevel {

	// No, we can't use an enum here. J2ME doesn't support it.

	/**
	 * L = ~7% correction
	 */
	public static final ErrorCorrectionLevel L = new ErrorCorrectionLevel(0,
			0x01, "L");
	/**
	 * M = ~15% correction
	 */
	public static final ErrorCorrectionLevel M = new ErrorCorrectionLevel(1,
			0x00, "M");
	/**
	 * Q = ~25% correction
	 */
	public static final ErrorCorrectionLevel Q = new ErrorCorrectionLevel(2,
			0x03, "Q");
	/**
	 * H = ~30% correction
	 */
	public static final ErrorCorrectionLevel H = new ErrorCorrectionLevel(3,
			0x02, "H");

	private static final ErrorCorrectionLevel[] FOR_BITS = { M, L, H, Q };

	private final int ordinal;
	private final int bits;
	private final String name;

	private ErrorCorrectionLevel(int ordinal, int bits, String name) {
		this.ordinal = ordinal;
		this.bits = bits;
		this.name = name;
	}

	public int ordinal() {
		return ordinal;
	}

	public int getBits() {
		return bits;
	}

	public String getName() {
		return name;
	}

	public String toString() {
		return name;
	}

	/**
	 * @param bits
	 *            int containing the two bits encoding a QR Code's error
	 *            correction level
	 * @return {@link ErrorCorrectionLevel} representing the encoded error
	 *         correction level
	 */
	public static ErrorCorrectionLevel forBits(int bits) {
		if (bits < 0 || bits >= FOR_BITS.length) {
			throw new IllegalArgumentException();
		}
		return FOR_BITS[bits];
	}

}
